During showdown of Mystic Vortex, do you need to pay extra power for Ambush like Rengar?
Yes — an Ambush unit like Rengar, Trophy Hunter costs [A] more to play during a showdown at Mystic Vortex.
Ambush is functionally "I have [Reaction] as long as I'm being played to a battlefield where you control Units" (Rule 822.1.b). Since Reaction is a referencable characteristic (Rule 813.4–813.5), Mystic Vortex sees Rengar as a card with [Reaction] while he's on the chain via Ambush, and its "cost [A] more" applies as a cost increase during step 3 (Rule 356.3). This is true even for Rengar's special line — "I can [Ambush] to a battlefield where there are enemy units" uses the Ambush verb and its permissions (Rule 822.1.d) — so the extra power is due.
References
Suggested answer — derived from the references below
Rules
Core Rules 2026-07-16 > Section 800: Keywords > Rule 822
Related FAQs
Related Cards
Correction History (1)
August 21, 2026 · reviewed by 156830844416294912
Removed the last line because even it’s played elsewhere as long as the showdown is ongoing it will cost one more.
Yes — an Ambush unit like Rengar, Trophy Hunter costs [A] more to play during a showdown at Mystic Vortex. Ambush is functionally "I have [Reaction] as long as I'm being played to a battlefield where you control Units" (Rule 822.1.b). Since Reaction is a referencable characteristic (Rule 813.4–813.5), Mystic Vortex sees Rengar as a card with [Reaction] while he's on the chain via Ambush, and its "cost [A] more" applies as a cost increase during step 3 (Rule 356.3). This is true even for Rengar's special line — "I can [Ambush] to a battlefield where there are enemy units" uses the Ambush verb and its permissions (Rule 822.1.d) — so the extra power is due.
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